blake



Dec. 4, 1928.

L. J. B. BLAKE MIXING MACHINE Filed sept 24, 1926 4 Shets-Sheet L. J. B. BLAKE MIXING MACHINE Filed p 1926 4 Sheets-Sheet 2 INVENTOR L. J'- B. B

L. J. B. BLAKE MIXING MACHINE Dec. 4, 1928. I 1,893,688

Filed Sept. 24, 1926 4 Sheets-Sheet 3 INVENTOR Dec. 4, 1928.

1,693,688 L. J. B. BLAKE MIXING MACHINE Filedrsept- 1926 4 Sheets-Sheet 4 INVENTOR L. J-B. BLAKE EW W ATTYS.

Patented Dec. 4, 1928.

UNITED STATES PAT N ()FFI E rams LIONEL .mivrns BAKER BLAKE, on VBISHOPS saron'rronn, ENGLAND.

MIXING IIIACHINE.

Application filed September 24 1926, Serial No,

The invention relates to improvements in mixing machines for concrete, tarmacadam and the like and refers not only to the portable type of apparatus commonly used 1n connection with, road making and building construction but also to apparatus for mixing glass batch, chemical and other mixtures; The object of the present invention is to pro-- vide a new and improved method of mixing the materials, improved means for delivery of the materials to be mixed into the mixing machine and means to facilitate the discharge of the mixed aggregate or agglomeration. I

According to the present invention the mixer comprises a cylindrical drum or casing that is normally stationary and preferably in halves bolted together provided with charging and discharging orifices mounted on a rotating axis or shaft and capable of partial rotation for emptying the contents thereof said shaftcarrying mixing scoops of a similar section to that of the well known elevator bucket the forward edges of said scoops extending practically the entire length of the interior of the drum within which they rotate whilst the rear edge is shorter and situated away from the axis or shaft to which they are secured so as to leave a space be tween said rear edge and the shaft forthe aggregate to fall when the scoops are successively elevated by the act of rotation and thereby obtain a cataract-like action of the agglomeration to bemixed. r

' or casing showing the rotatable mixing scoops in end elevation. i Figure 4 a sectional elevation taken on line wx' of Figure 3 incorporating parts shown in Figure 1. i

Figure 5 is a detail in connection with the construction of the mixing scoop and- Figure 6 is a side elevation showing means for effectingthe tilting operationfor the discharge of the contents combined with a. shockv absorbing device.

Referring nowto the drawings in which similar reference characters relate to likev parts in all the figures thereof the mixer 137,579, and in'Great Britain November 7, 1925i inside the drum or casingia whereby the maj terials are lifted and mixed within the said drum which during the mixing operation remains stationary.

The blades paddles or scoops e are of peculiar construction and designed to obtain a cataract-like-iaction of the a regate or ag glomeration to be mixed and instead of as heretoforeemploying several rotatable arms with blades fixed to their ends it has been found to be considerably more efficient to makethe blades or scoops of a similar cross' section to tha-t of the well known elevator bucket as shown in the drawings the forward edge 7 of said scoop extending practically the entire length 'of the drum a within which it rotates therearedge g or that near toithe axis being shorter, and secured to spider frames 7L away-from the shaft b'so as to leave a space between the shaft 7 and the rear edge r7 of the scoop e for the material to fall y when the scoop e is elevated bv the act of rota tion, the ends 7' of the scoop being thus in:

clined a -natural tendency to throw the materials towards the centre of the drum is also produced. According to the capacity of the machine so is the number of the scoops in creasedor decreased as the case may be and in the small size machine even two would suffice structure by stay rods 7c connecting the seV-. eral ends together circumferentially.

Preferably the forward edge of the scoo e is provided with replaceable serrated bevelled metal strips m. see Figures ty and 5 to minimize the detrimental effect caused by hard pieces of the aggregatejambing between theedge of the scoop e and the drum a such serrated bevelled surfaces suti'icing usually for. the easv removal or turning over of such obstacles that would otherwise cause damage to the machine. The serrated bevelled metal strips m mav be provided with a rearward extension m that practically fills up the wedgeshaped {space between the scoop e and the ink ter'ior surface of theldrum a but obviously to i i but obviouslya'better balancing eflectiis obtained vby the employment of three'bv'which also means arevaiforded for stiifening 'the I such extensions or blocks m may be separate and distinct fromthe strips m. For mixing some materials the replaceable metal strips may be dispensed with.

The drum creasing a is preferably made in halves bolted together and for convenie ice they may be hereinafter referred to as the upper and lower halves a a respective y.

Theupper halt a of the casing or dr is provided Witht-vo openings, one a i charging the material to be mixed and the other 0 for discharging the mixed ag ioine tion. These openings may be litted with suitable doors or covers, independently automaticlly operated but doors or co ers not essential, and are therefore omittec from the drawing.

V The mixermay be titted with batch hopper or sideloader. in the latter case of the employmento'f a sid'cloader as illustrated in the drawing this is "formed a, a scoop or container 79 vith extended arms 9 that are capable of rotation about the n shaft Y) 01 the drum creasing a, and can be hoisted into the charging position shown in dotted line Figure 2 by means ot aquadrant or quadrants 9" mounted outside the drum a on the shait b and attached to the cas 1- l arms {I of the scoop 79, the quadrants r caused to rotate and'hoist the charging scoop 19 by means of suitable gearingand clutch gear in connection With the driven shaft the engine.

In the arrangement shown in the drawing it will be seen that the primemover is the internal combustion engine 1 which through bevel gear 2 imparts rotatory motion to the driven shaft 3 Whichby sprocket pinion' i the female part of clutch sprocket 5 is driven by an ordinary drive chain 6. To the clutch a feed spout sprocket}? isfi-Xed the sprocket wheel 7 which With the aid oi chain 8 imparts continuous rotatory motion to the shaft 7) by the sprocket ivl1eel'9. The rotatory motion of the sprocket Wheel'lO is governed by the male halfll if the clutch that is operable by the hand lever l which synchronously releases or applies t ieband brake 13 in the Well known manner. The sprocketlO by the chain 1%. drives sprocket Wheelie on shaft 18 that carries the pinionss which mesh with the quadrants T.

It will be clear from the foregoing description that to charge themachine the feed scoop j) is filled with the necessary materials and then raised into the elevated position by the manipulation of the operating lever 12 whereby the pinions 5 are rotated and operate the quadrants r so that the contents of the scoop ill be delivered or fall into the drum throu the charging orifice a. After the char has been eii ected the scoop 2) is lowered r into its lowermost position for refilling b manipulation of the operating lever 12 with the aid of the brake mechanism l he shat Z; of the mixer (carrying the scoops). rotates neeaese cont nuously ininii'ig the materials and assisting in the discharge of the same when the i is completed.

he co oletion oi the mi:

irough a su dil' effected by hand in ""fil'ifl so tha k I i 1 I h i llll tilSCliJlc.

pen the brackets 12% so thabearings 5 or oscillatory inor t the drum a. m tension springs 25 is regulated a on of the nuts 26 on he e e-bolt' 23 in the liner-In manner.

In thev foregoing descriptio presumed that the machine is or the self-c in tained portable type the internal conbistion engine 1, being mounted on the carriage or chassis (Z beneath the drum a of the mixer said engine driving a counter shaft by which the mixing paddles are rotated and the hoistgear set in action by the clutch mechanism as and when required. @bviously Where the mixer is used as ast-ationa'ry machine it may be driven by any convenient means i. e. electi'c motor, fast and loose pulleys, or hand power.

Furthe more the mixer as above described may be employed'in' combination iyithone or more drying drums, of similar construction and provided With afurnace when dealing -with tarmacadam or other bituminous mixtures, the Whole combination being mounted on a suitable frame and constituted as portable or stationary apparatus as desired.

l/Vhat I claim is 1. A. mining machine for concrete, tarmacadam and the like comprising a normally stationary mixing drum provided with charging and discharging orifices, shaft on which said drum is mounted, a plurality of mixing scoops carried on said shaft Within said drum and means for imparting a continuous rotation to said shaft whereby said scoops are successively elevated, the forward e es oi'said scoops extending practicallythe entire length of-the 1,693,688 ii p I Y 3 interior of said drum and the rear edges thereof being of lesser length than said forwardedges and situated away'from said shaft, inclined-ends connecting said forward and rear edges of said scoops, and meansfor tilting is mounted, a plurality of spid r frames se-- cured to said shaft within said drum and a plurality of mixing scoops carried by said 7 frames, stay bars connecting the ends of said scoops, means for imparting a continuous rotation to said shaft whereby said scoops are successively elevated, the forward edges of said scoops extending practically the entire length of the interior of said drum and the rear edges beingof lesser length than said for ward edges and secured to said'spider frames, inclined ends connecting said forward and rear edges of said scoops, and meansfor tilt ing said drum todischarge the mixed mate: rial. j v r 8. A mixing machine for concrete, tarmacadam and the like comprising a normally stationary mixing drum provided with charging and discharging orifices, a shaft 011 which said drum is mounted, a plurality of mixing scoops carried on said shaft within said drum and means for imparting a continuous'rotation to said shaft whereby said scoops are successively elevated, the forward edges of said scoops extending practically the entire length of the interior of said drum and the rear. edges thereof being of lesser length than said 7 forward edges and situated away from said shaft, inclined ends connecting said forward and rear edges of said scoops, replaceable serrated metal strips secured to said forward edges of said scoops, and means for tilting said drum to discharge the mixed material.

a. A mixing machine for concrete, tarmacadam and the like comprising a normally stationary mixing drum provided with charging and discharging orifices, a shaft on which said drum is mounted, a plurality of mixing scoops carried on said shaft within said drum and means for imparting a continuous rotation to said shaft whereby said scoops are successively elevated, the forward edges of said scoops extending practically the entire length of the interior of said drum and the rear edges thereof being of lesser length than said forward edges and situated away from said shaft, in

clined ends connecting said forward and rear bolts to which the free ends of said ropes are attached, springs surrounding said eyebolts and a catch for locking said handle in its inoperative posltion.

' In testimony whereof I afiix my signature.

LIONEL JAMES BAKER- BLiiKn 

